128805467775 has 24 divisors (see below), whose sum is σ = 218152485264. Its totient is φ = 67020729600.

The previous prime is 128805467773. The next prime is 128805467803. The reversal of 128805467775 is 577764508821.

It is not a de Polignac number, because 128805467775 - 2¹ = 128805467773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128805467771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20940904 + ... + 20947053.

It is an arithmetic number, because the mean of its divisors is an integer number (9089686886).

Almost surely, 2^128805467775 is an apocalyptic number.

128805467775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128805467775 is a deficient number, since it is larger than the sum of its proper divisors (89347017489).

128805467775 is a wasteful number, since it uses less digits than its factorization.

128805467775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41888011 (or 41888006 counting only the distinct ones).

The product of its (nonzero) digits is 26342400, while the sum is 60.

The spelling of 128805467775 in words is "one hundred twenty-eight billion, eight hundred five million, four hundred sixty-seven thousand, seven hundred seventy-five".